# System Integration Test: Multi-Component Error Propagation

## Summary
Validate how errors propagate and are handled across multiple system components.

## Components Under Test
All components, focusing on error handling and recovery

## Test Scenarios

### Test Case 1: Database Connection Loss
- **Trigger**: Disconnect database mid-flight
- **Expected**: System detects, caches results in memory, reconnects when available
- **Components Affected**: Result Manager, Flight Manager, Database Layer

### Test Case 2: GPU Out of Memory
- **Trigger**: Exhaust GPU memory
- **Expected**: Clear error, processing paused or fails gracefully
- **Components Affected**: Model Manager, Vision Layers

### Test Case 3: Satellite API Failure
- **Trigger**: Google Maps API returns 503 error
- **Expected**: Retry with exponential backoff, use cached tiles if available
- **Components Affected**: Satellite Data Manager

### Test Case 4: Corrupted Image File
- **Trigger**: Upload corrupted image
- **Expected**: Detected by Image Input Pipeline, marked as failed, skip and continue
- **Components Affected**: Image Input Pipeline, Flight Manager

### Test Case 5: Vision Layer Cascade Failure
- **Trigger**: L1, L2, L3 all fail for same image
- **Expected**: Failure Recovery Coordinator requests user input (AC-6)
- **Components Affected**: All vision layers, Failure Recovery Coordinator

### Test Case 6: SSE Connection Drop
- **Trigger**: Client SSE connection drops
- **Expected**: Events buffered, client can reconnect and catch up
- **Components Affected**: SSE Event Streamer, Result Manager

### Test Case 7: Configuration File Invalid
- **Trigger**: Corrupt configuration file
- **Expected**: System uses defaults, logs warning, continues
- **Components Affected**: Configuration Manager

## Success Criteria
- All errors detected and handled appropriately
- No silent failures or data corruption
- Clear error messages provided
- System recovers or fails gracefully
- Processing continues where possible

## Maximum Expected Time
- Each error scenario: < 30 seconds
- Total test: < 300 seconds

## Pass/Fail Criteria
**Passes If**: All errors handled gracefully, no crashes, recovery works
**Fails If**: Unhandled exceptions, crashes, silent failures, data corruption

